IDEA 6.0 and ANT build.xml problem

Hi,

I have a project with multiple modules. I can "Add" an Ant build file(build.xml) that is at the project level to the Ant Build Tool Window, but I cannot add one that is at the module level in IDEA 6.0.1. This works fine in IDEA 5.1

Anyone know what's going on ?

Thanks
Pradeep